update moby/buildkit docker tag to v0.19.0
- upgrade moby/buildkit to v0.16.0
- fix #2 - forgot to pin `moby/buildkit` version - add renovate bot that will keep buildkit up to date - add CI to test the template before changes are merged
- [docker-buildkit] in rule, use `when: on_success`, not `always`
Store buildcache in separate path instead of tag
add variable DOCKERFILE_PATH
[docker-buildkit] cross-platform builds & buildkit args
Dummy release to test upgrades